ANS:
There are 12 inches in one foot so multiply 5 feet by 12 inches to get 60 inches plus the 7 inches in the 5′7″ to get 67 inches.
So 5′7″ equals 67 inches.
To check divide 67 by 12 to get 5 with a remainder of 7 or 5′7″ so 67 inches is your final answer.